Python-呈现Jinja模板和电子邮件

Question

我正在测试我从Github得到的这段代码，以呈现jinja模板并作为电子邮件发送
当我按如下方式运行代码时。我收到以下错误消息。需要帮助来识别和解决问题。谢谢

JayMac$python3"；send_email.py"；

错误：root:发送电子邮件时出错
错误：root:filter类型的对象没有len((
Traceback(上次调用(：
文件"send_email.py"；，第47行，在send_email中
server.sendmail(sender，to_list，msg.as_string(((
File"Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/smtplib.py"；，第878行，在sendmail中
如果len(senderrs(==len(to_addrs(：
类型错误："filter"类型的对象没有len((

这是我正在使用的代码-

*** send_email.py ****
import sys, os.path, logging 
from jinja2 import Environment, PackageLoader
from os import path 
def render_template(template, **kwargs): 
''' renders a Jinja template into HTML '''
# check if template exists
if not os.path.exists(template):
print('No template file present: %s' % template)
sys.exit()
import jinja2
templateLoader = jinja2.FileSystemLoader(searchpath="/")
templateEnv = jinja2.Environment(loader=templateLoader)
templ = templateEnv.get_template(template)
return templ.render(**kwargs)
#-----------------------------------------------------------
def send_email(to, sender='jk<[e-mail]>', cc=None, bcc=None, subject=None, body=None):
''' sends email using a Jinja HTML template '''
import smtplib
# Import the email modules
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from email.header import Header
from email.utils import formataddr
from email.mime.base import MIMEBase
from email import encoders
# convert TO into list if string
if type(to) is not list:
to = to.split()
to_list = to + [cc] + [bcc]
to_list = filter(None, to_list) # remove null emails
msg = MIMEMultipart('alternative')
msg['From']    = sender
msg['Subject'] = subject
msg['To']      = ','.join(to)
msg['Cc']      = cc
msg['Bcc']     = bcc
msg.attach(MIMEText(body, 'html'))
server = smtplib.SMTP_SSL('smtp.gmail.com') # or your smtp server
try:
server.login('[e-mail]', 'password')
logging.info('sending email xxx')
server.sendmail(sender, to_list, msg.as_string())
except Exception as e:
logging.error('Error sending email')
logging.exception(str(e))
finally:
server.quit()
#-----------------------------------------------------------------------------------
# MAIN
item1 = 'kryptonite'
item2 = 'green clothing'
# generate HTML from template
html = render_template('default.j2', vars=locals())
to_list = ['[e-mail]', '[e-mail]']
sender = 'jk<[e-mail]>'
cc = ''
bcc = ''
subject = 'Testing Jinja Email'
# send email to a list of email addresses
# send_email(to_list, sender, cc, bcc, subject, html.encode('utf-8'))
send_email(to_list, sender, cc, bcc, subject, html)

Answer 1

错误在这一行：

to_list = filter(None, to_list) # remove null emails 

应该是

to_list = list(filter(None, to_list) # remove null emails

因为sendmail需要实际的list，而不是filter()返回的迭代器类型。